10.4.11 to 10.5.4

Hello and happy holidays to all,
I'm having problems installing Leopard - v 10.5.4 on my Powerbook that is using Tiger - v 10.4.11. When I try to run the install from the disc, I get a message that says; "Unable to install on this computer."
I've got 12.48GB of free space on my drive and I've backed up my hard drive, (73gigs worth of files and info) using "Super Duper", and placed the back up on a 1TB external drive.
1. Do I now need to wipe my Powerbook hard drive clean to perform this install?
2. Can I jump straight to 10.5.4 from 10.4.11 or do I need 10.5.0 first?
(The discs I'm attempting to use have the following information on them) -
"For Mac Computers - Mac OS X Install Disc 1
Mac OS version 10.5.4 - AHT version 3A152 - Disc version 1.0 2Z691-6248-A"
Any help would be appreciated!
Below are my machine specs from System Profiler:
Machine Name: PowerBook G4 17"
Machine Model: PowerBook5,7
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.67 GHz
L2 Cache (per CPU): 512 KB
Memory: 1 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.9.1f1

AHT version 3A152
You need to use a retail package and not one which shipped with a Mac. Any disk with a listed AHT version is specific to the Mac it came with; no retail disk includes Apple Hardware Test.
A retail package doesn't require an earlier version of Mac OS X 10.5 be installed.
(49593)

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